We tend to have raw veg rather than cooked to save on fuel/time, so chopped carrots, cherry tomatoes, peppers etc.
We also take a frozen meal but to have on night number 2 as it's often still too frozen.
Orzo (rice sized pasta) can be cooked in many dishes and adds substance. Bread is also a good carb- pittas and tortilla wraps.
If you have EHU you could also take a slow cooker, we do a ham joint or one pot meals in that.
I also tend to look for other short cuts as possible- sliced/grated cheese, individual pots of yoghurts etc as very often they save on prep and washing up.
Always have an emergency meal or a tin stash- beans, soup, noodles, hot dogs, tuna, tinned ham etc.
Put any spices in tic tac containers, and don't forget things like tomato ketchup, salt and pepper etc.
We have got into the habit of having some tapas around for us if we are cooking for the kids and for us later.
We take the mini boxes of cereal and brioches which keep the kids happy even if they have a cooked brekkie later.
Save an old squash bottle and make up diluted squash to keep handy.